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Titre du document / Document title

Sex organ determination and differentiation in the dioecious plant Melandrium album (Silene latifolia) : a cytological and histological analysis

Auteur(s) / Author(s)

FARBOS I. (1) ; OLIVEIRA M. (2) ; NEGRUTIU I. (3) ; MOURAS A. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Laboratoire Biologie Cellulaire, Université de Bordeaux II, FRANCE
(2) Departement Biologia Vegetal, Ciencias de Lisboa, Portugal Bloco C2, Campo Grande, 1700 Lisboa, PORTUGAL
(3) Ecole Normale Supérieure de Lyon, FRANCE

Résumé / Abstract

Melandrium album (Silene alba) is a dioecious plant with heteromorphic sex chromosomes (XY system). Sexual dimorphism is a result of developmental blocks in male or female reproductive organ formation within young bipotential flower buds. Progress in understanding the genetic and molecular mechanisms controlling sex determination in this species relies on a detailed description of developmental timing in the two sexes, with emphasis on those early stages during which sexual dimorphism is established. We used a combination of histological and scanning electron microscopy analysis to refine the comparative study and description of the staging of male compared to female flower development. We show that (1) female dimorphism results from modifications in flower meristem organisation, namely a sudden arrest of cell divisions in whorl 4 of male flowers at the time when meristem partitioning is achieved between whorls 3 and 4, and (2) male dimorphism is part of the stamen differentiation process corresponding to stamen arrest at the early sporogenous stage in female flowers. Thus, Melandrium is a natural double mutant that is affected in very early and distinct processes of reproductive organ differentiation. Our results are used to discuss the most likely nature of the specific functions controlling sexual dimorphism in Melandrium.

Revue / Journal Title

Sexual plant reproduction    ISSN  0934-0882 

Source / Source

1997, vol. 10, no3, pp. 155-167 (19 ref.)

Langue / Language

Anglais

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (1988) (Revue)

Mots-clés anglais / English Keywords

Dioecy

;

Sexual dimorphism

;

Development

;

Plant reproductive apparatus

;

Sex determination

;

Histology

;

Ultrastructure

;

Meristem

;

Cell differentiation

;

Weed

;

Caryophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Mots-clés français / French Keywords

Dioécie

;

Dimorphisme sexuel

;

Développement

;

Appareil reproducteur végétal

;

Déterminisme sexe

;

Histologie

;

Ultrastructure

;

Méristème

;

Cytodifférenciation

;

Silene latifolia

;

Mauvaise herbe

;

Caryophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Mots-clés espagnols / Spanish Keywords

Dioecia

;

Dimorfismo sexual

;

Desarrollo

;

Apparato reproductor vegetal

;

Determinismo sexo

;

Histología

;

Ultraestructura

;

Meristema

;

Diferenciación celular

;

Malezas

;

Caryophyllaceae

;

Dicotyledones

;

Angiospermae

;

Spermatophyta

;

Localisation / Location

INIST-CNRS, Cote INIST : 21512, 35400006790084.0050

Nº notice refdoc (ud4) : 2762901



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